Giaỉ các phương trình lượng giác sau:

1. 2sin2x+3sinx=3cosx

2. sin2x-4(sinx-cosx)=4

3. (1+sinx)(1+cosx)=2

4. 2(sinx-cosx)-sin2x-1=0

5. sinx-cosx+4sinxcosx+1=0

6. sinx=2cos\(^3\)x

7. cosx=2sin\(^3\)x

8. 2cos\(^3\)x=sin3x

Dạng: Phương trình bậc nhất đối với sinx và cosx:

Giaỉ các phương trình sau:

1.\(\sqrt{3}\) sin x-cos x+\(\sqrt{2}\) =0

2. 3sin2x+2cos2x=3

3. \(\sqrt{3}\) sinx -3cosx=\(\sqrt{6}\)

4.\(\sqrt{3}\) sinx-cosx+\(\sqrt{2}\) =0

Change the following sentences into reported speech

1.The woman sai:"When will I return home"

2."Listen carefully"she said to us.

3.He asked me:"Why didn't you come here yesterday?"

4."I'd get up early if I were you"She said to me.

5."Why don't we go for a walk?"said Mary

6."Would you like some coffee?"He said to me.

7."Do what you like".Said Tom to Mary.

8.He said"Where are you going,Miss Black?"

9.The policeman said to the boy:"You stole the bicycle."

10.The boy said:"I did not steal the bicycle"

11."Have you finished your work yet?"Lan asks me.

12.The boy said to his mother:"I will study harder to make you happy."

13."Yesterday I didn't go to school because I was tired."He said.

14."What are you doing at the moment , Lan?"Her mother said.

15."Do you go to school today?"asked the father.

Rewrite the following sentences using the words given in brackets

1.Would you mind waiting for a moment?

=>Would you please........................................

2.I'd rather read books than watch television.

=>I prefer reading.......................................

3.The film star wore dark glasses so that no one would recognize him.

=>The film star avoided.............................

4.I felt it had been a mistake to write a letter.

=>I regretted ever......................................

5.He was sorry that he didn't see Ann on her trip to London.

=>He greatly..............................................

6."Were I you, I wouldn't trust Peter," she told John

=>She advised......................................

7.It's pointless to have that old typewriter repaired.

=>The old typewriter is not.............................

8.She admitted that she had taken the necklace.

=>She admitted.....................................

9.I was going to leave,but because of what she said,I didn't

=>She persuaded........................................

10."Why don't we share the cost"said my friend.

=>My friend suggested....................................

11.They spent these days solving that problem.

=>It took.....................................................

Giúp mk vs nha!!!